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A study was performed to evaluate the effect of anti-expansion solution on setting expansion and setting time of dental plaster. Test solution (6% anti-expansion solution composed of 6% potassium sulphate and 0.6% borax) was prepared with water at room temperature. Dental plaster (Hnin Peral, Myanmar) was mixed with ordinary tap water or test solution in the water powder ratio of 0.45 at room temperature and poured on the mounting plate of the mean valued articulator (Proarc IG, Shofu, Japan) in a size of 48 mm in diameter and 45 mm in height. Vertical dimension change was measured on the articulator between two points; one on the movable arm and the other on the base by using digital slide caliper after 1, 2 and 24 hr. Student’s t test was employed to analyze the results. Vertical dimension changes of control and test groups after 2 hr were 0.65 mm and 0.15mm respectively which was statistically significant (p<0.001). Setting time with anti-expansion solution was also significantly less than control. It was concluded that tested anti-expansion solution accelerates the setting time easing the handling of the mounting casts and reduces the setting expansion of plaster, effectively reducing vertical dimension change and preventing the laboratory errors.
Every indirect dental prosthesis is fabricated
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